"We got some strong data on manufacturing, and the market is responding to the ISM numbers," said Richard Bryant, head of Treasury trading at MF Global. "The market has been under pressure ever since the release of that data."

Meanwhile, a separate report indicated that personal income registered an unexpected dip in September, while spending by individuals grew at a slower rate than expected, according to data released by the federal government.

But Monday's mixed economic data is going to be lost in the shuffle as investors wait on three major pieces of news: Tuesday's midterm elections, Wednesday's Fed announcement, and Friday's jobs report, said William Larkin, portfolio manager at Cabot Money Management.

"We have three major data points coming up, and I would not expect anything other than minor adjustments today," Larkin said.

Wednesday's Fed announcement has been anticipated by bond traders for weeks, and it is now widely expected that the Fed will launch another round of monetary stimulus in an effort to boost the economy.

"The real question is the degree to which the Fed will take action," Bryant said.

Yields: The yield on the benchmark 10-year note also rose, edging up to 2.63% from 2.61% on Friday. Treasury prices and yields move in opposite directions.

Treasury prices fell across the board on Monday, with the yield on two-year unchanged at 0.33%.

The yield on 5-year Treasury notes eased to 1.16%. But the 30-year yield rose to 4.02% from 4% on Friday.

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